package com.example.function_interface.function;

import com.example.function_interface.User;
import org.junit.Test;

import java.util.ArrayList;
import java.util.List;
import java.util.function.LongFunction;

/**
 * 接受一个long类型输入参数，返回一个结果。
 */
public class LongFunctionTest {
    @Test
    public void myTest() throws Exception{
        List<User> userList = new ArrayList<>();
        User user1 = new User(1, "张三", 12, false, 23.8);
        User user2 = new User(2, "李四", 22, false, 200);
        User user3 = new User(3, "王五", 32, true, 123.2);
        User user4 = new User(4, "郑静", 2, true, 0);
        userList.add(user1);
        userList.add(user2);
        userList.add(user3);
        userList.add(user4);

        LongFunction<User> longFunction = new LongFunction() {
            @Override
            public Object apply(long value) {
                return userList.get((int) (value-1));
            }
        };
        System.out.println(longFunction.apply(1).getName());
    }
}
